shally5ann shally5ann

25-08-2016
Mathematics

contestada

How can I solve the following system of equations: -4x + y= 6, -5x -y =21. I know I can cancel out but I don't know where or where to go from there.

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Kunchan Kunchan

25-08-2016

-4x + y = 6
-5x - y = 21

add both of them
-9x = 27
x = -3

(-4*-3) + y = 6
-12 + y = 6
y = 18

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